The calculation, without hidden assumptions
Wind chill estimates the increased heat loss from exposed skin caused by moving cold air. MAXScanner uses the current U.S. National Weather Service equation, which is defined for air temperature at or below 50°F (10°C) and wind speed above 3 mph (4.8 km/h). Inputs can be entered in common temperature and wind units, but the governing calculation is normalized to °F and mph before evaluation.
How to use this calculator
Choose °C or °F and enter the actual air temperature.
Choose mph, km/h, m/s or knots and enter the sustained wind speed.
Check the validity diagnostic. Outside T ≤ 50°F and V > 3 mph, MAXScanner reports the NWS equation as not applicable instead of extrapolating it.
For valid conditions, compare the wind chill with actual air temperature and use the scenario table to see how stronger wind changes the exposed-skin heat-loss index.
Where people use it
- •Cold-weather travel and outdoor-work planning using the same validity domain as the NWS index
- •Comparing how different forecast wind speeds change apparent cold at a fixed air temperature
- •Checking °C/°F and mph/km/h equivalents without changing the underlying weather state
- •Explaining why wind increases exposed-skin heat loss without implying that objects become colder than the actual air temperature
Worked example — 0°F with 15 mph wind
For T = 0°F and V = 15 mph, V^0.16 ≈ 1.542. Substituting into the NWS equation gives a wind chill of about −19.4°F (−28.6°C). Both inputs are inside the NWS validity range.
What the result does not assume
- •Do not extrapolate the NWS equation above 50°F (10°C) or at wind speeds of 3 mph (4.8 km/h) or less. MAXScanner reports those states as outside the model range.
- •Wind chill is an exposed-skin heat-loss index, not the actual air temperature. Wind can make an object cool toward ambient temperature faster, but the wind-chill value itself does not cool an inanimate object below the real air temperature.
- •The NWS model assumes no solar warming. Bright sunshine can make conditions feel warmer than the calculated shade/no-sun wind chill.
- •This calculator is not a deterministic frostbite timer or medical assessment. Use official warnings and local cold-weather guidance for safety-critical decisions.
Frequently asked questions
When is the NWS wind-chill formula valid?+
The NWS specifies air temperature at or below 50°F (10°C) and wind speed above 3 mph (4.8 km/h). The calculator shows a not-applicable diagnostic outside that range.
Does sunshine change wind chill?+
The standard index assumes no solar warming. NWS guidance notes that bright sunshine can make apparent conditions feel warmer than the calculated wind chill.
Can wind chill freeze water when the air is above freezing?+
No. Wind can increase convective cooling rate, but an inanimate object cannot be driven below the actual ambient air temperature by wind alone. Wind chill is designed around exposed-skin heat loss.
Can I enter km/h, m/s or knots instead of mph?+
Yes. MAXScanner converts the selected wind unit to mph for the NWS equation and reports useful mph/km/h equivalents in the result.
Semantic next steps
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